Swiftlint: Rule Request: Redundant import

[biboran]

New Issue Checklist

• [x] Updated SwiftLint to the latest version
• [x] I searched for existing GitHub issues

Rule Request

Redundant imports often lead to the confusion about the responsibilities of declarations within a file. I don't know any reasons for why anyone would want to have import declarations of the module they don't use.

1. Why should this rule be added? Share links to existing discussion about what
   the community thinks about this.

I didn't find any

1. Provide several examples of what _would_ and _wouldn't_ trigger violations.

Would trigger:

import UIKit
class Foo { }

Wouldn't trigger:

import UIKit
class Foo { let bar = UIView() }

1. Should the rule be configurable, if so what parameters should be configurable?

No

1. Should the rule be opt-in or enabled by default? Why?
   See README.md for guidelines on when to mark a
   rule as opt-in.

Such rule should be enabled by default

[jpsim]

This would require SwiftLint to run in a "compiled mode" as I've discussed before.

[biboran]

@jpsim is it something you don’t consider for implementation?

[marcelofabri]

@jpsim can we close this as https://github.com/realm/SwiftLint/pull/2381 was merged?

[jpsim]

Nice find, yes! 8fd15b0b

[realm-probot[bot]]

Hey - looks like you forgot to add a T:* label - could you please add one?